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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ecceba756323b611d6fcb486f70c2f282272923319c9f5087cb7896efaef155' 
  AND token = '4upiluJRlZ0F22lVRsQRd6tJI4DfFGryUrhuFZw1haQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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