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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '374150714822ca4135ced64af3ac0874122c94643ba7d633df887dd4a119d79c' 
  AND token = 'lKF67EwT0Y/Bf+TB2GAzPMdPvIQMIRUGtzYbWIpxr8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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