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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14ef825de38864a67f61b8c5403402ac3bd4b66c3cb9e11119e6f034e286e8ca' 
  AND token = 'n2I60WThbT5zmgqvkWgd6+Qs+JE3j6YYYTB6ylPQOKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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