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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0bdd7e321855b2a9a2ab0eb9e1a657238b209471e9ec80f1d4d61dcbaf84dff' 
  AND token = 'd10tqi2kMnPqVCkWFhOUTDeCYLsueON2Pus1uOxBBlw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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