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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d82a39ec9b0a843bbd591a4a072214f5417f9b907338df42c9a830afc7c8d72' 
  AND token = 'DgDub77lC1TJR5f0JIe/Dr3+YeYmFfDB9J35oj3ufHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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