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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc2d3ba75e97518403c5fbf6d390ac70c256c1cd5e58aad3833733db67fb9b4d' 
  AND token = 'qScJtF4zOwrt+L3Rpz6ALz46DvrRbpWeuAbEdyUn9GY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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