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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5997fc085466e7fa695716ef82bad34fefa289ee85ae3805d05c26f74a7bb2f9' 
  AND token = 'YY2rVQcN48IMnBx2JsjARX+/LApCTA6k1J4NPq06X/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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