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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '988be4d079ef183608931d34036a30eece7348862ca69340b5d3d80f8426bec1' 
  AND token = 'wP6b7353U+KSG+WOEkr7YS8qU9TndB5UpCMliFjSkgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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