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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1fba2fe5bd1d8e55cd50b6c3bdf4e04b96bcaef41c9f0653525c6374722a6b0' 
  AND token = 'tOk45voLFS5h56PgE2y3yzE0jUTaiw4on/oOMRX1E48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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