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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f019d5094339da6870b152182625faf2e2e476ed0fb8283c1bce9813475c99dd' 
  AND token = 'uhJ90/+J55M2jdYvHeto6A5Zzs2kLl//uHUWpDUtWr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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