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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0291bdd34afb70efd8ac5504057479c7779f93f86e6d57906b2d2b652e495298' 
  AND token = 'Wb/hRZ5HVYOM8UVi8IyQ86LbTQuRkGUJLrQcAEvEO8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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