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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59f968a4fe15570b64871c0d197baa8a82b6cf0a73a6ef82d9a6cc4505e469d1' 
  AND token = 'z6DcmDTYMs75B8GikE2wfAuN7Tf122MiEgpljPod/fw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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