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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a624de79f5a517edc79214071fbee485e9bdba231d62448119a87ca76befbccb' 
  AND token = '7BEM7/x+3opOO7iYP/uoMca7lpE9GWQEsZDZQ+YR8yk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}