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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76239883b56c44e27bcf247db2edd435251baebe587775e910e36443190e2229' 
  AND token = '7GB96BxEnDYw2lpTWcHO9YN5L7mB9a0r1knUBTz6kYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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