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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8a44b6ccb1de2632ca8ef0e296e391d850f1ca69476953ca7c35c9f0d012d2e' 
  AND token = '2Kss7qpx6jrZdnScVAJoZ4nnBYb1MImI4tUJ5rZoOZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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