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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4eb554b21bf61b8da5e51f68453e9b31e12190dfe58b2f00b74327c0a153c93' 
  AND token = 'uk79VA8QyIP0em1kJ0yC6b+IQ2g7qUzOJX2eqPv9Pic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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