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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6773b2eb8e6b5193d1cf5dd99ef495aeca4d914f1ec20a5721bc0bf46b186c9' 
  AND token = 'Mh8I+an0VJ0cBOTSq+wa4wPd3dGLmf+c8LCvYj0qmc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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