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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '827f906b7101611241d808365565b20477b0926dd9b54cd02566a215445f6d0d' 
  AND token = 'rHjgXkPIbIRJemo0tqsuO7ZkJwyqCIhEXqWsGx9I5PU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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