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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0093d9712dd666e263e5dc8d03d2c6a6a3648ede34f294defbdfc9cbf7a2665' 
  AND token = 'QF8q4SRqmjKQj6/OxUzqttLTOd14oIxzjIrW/PBLrKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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