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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f66d7d9255e2bfc12afd75c0ed07390d9504fc09ca9909df9dfacef368905519' 
  AND token = 'qA5/Y/IWzhr9UEOb93NcqhbtwDr69aPasb4NMfa+aH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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