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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5595995321e89a7eed1dfbb1f8d208a01e422353d752838ebd55c6a03efc72ac' 
  AND token = 'FcUCaTrTec6xObANY+T8DQE6gK2HW/o6iTy4vnGAylY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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