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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6364d7824f3aee7ae875e4bb28d6bfc017c502bd4ec4685b0838630abf4b6230' 
  AND token = '9U58BEE1dEUQcpLdgivkFpQKNygeEu0lSvcbrzE6SA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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