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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6cb91b337470123607bfdf6873a7316a2eda5d89fe85bdb15378757820d0d80' 
  AND token = 'Q4r4lXpSq9v1DTLw47Bx3RUPkML6I9mqzI+tnJhDDCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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