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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c79c8a9e09c42d92a0a1706c2368d47519babe9ceb5ece5f32a7c9b86b89b8d' 
  AND token = 'F+211qEXYVCnwfcJG1lApa+wqGrTMIVGxY+PUe7CKCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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