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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '977663f637feef70d7e8ed2658c05a7560829152b7cf1e9fbe2401bdd0731d7b' 
  AND token = 'GeJMPF9Qka7XDKYBZGJGLpblrezFC33QILAxu7/1kH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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