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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a920b8476ea1996ede81138aa6847148f31609d0348f7d8a65617cd1ca67c29e' 
  AND token = 's6yRoEAvNM8L28k5dh7sPTWfxZ5F5k9NEZQbYfAlPkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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