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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf330350513aa1108614fbbc8640511d93158b0ebc8f906f311254bec459c402' 
  AND token = 'q5h/RBOmtYfEaCQHHOzwsveLU1V6gjc8P9NeMFPmo1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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