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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05dcd8f8f578befab5156639a5fe168d0a4ffd6e5ab2e5deff24fc7e1676209e' 
  AND token = 'RCzqiNq4/ADimMG4AnkgrUttoscW4uL6mPhwkeHPpAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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