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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b92eba7accd8e009310f8a1434b1c30822108d73ad01ce3cf5492582be27f4bd' 
  AND token = '4pjFTypp7WDv3moPPIdR6PhGe1tON7njaU4hUexE8Kw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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