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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44cd7befd6f5f1f88e5fd326b721643bf24cd2c7315895be88319b5203ab89a7' 
  AND token = 'mRiPpL45mJ0S/SbozbPpNhgSptNGes/I9qe/qdGJZPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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