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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56702973e306a225020668db9e76d686548dd6571839bf1a1a5d434f75015d6a' 
  AND token = 'rnjledER9SSpxtZEQJaZiz2ZDw3KPCJsjSD3TPkM2Do=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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