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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51259cbb5c5dbd7f7b40fc2838ff23956dc6cd2e7f82815a67a0d9de2ea2984f' 
  AND token = 'hFxx5JpShcQHNQdGOOtJO4Q4UA5N9rd6O046POduNJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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