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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ae9202c8e73564392c6bf6c3bc26cf8e67396ac9d8d41ddda0be436b86ac697' 
  AND token = 'w06r38FknU/DOG/nPJTEYD3CMRdqy0hpEJHr1vOW/Rk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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