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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c56206ef5f4a1929d285d97146c9ecd8a78475b50f3b338c2bc3532b1c7f32ed' 
  AND token = 'xIvNrHB6zEnl7qRPGKSVX5fDk88+B135kaAEqyeNNG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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