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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '357e1055e513b3c191811b87562c873768aa4e1b9f5516452da90acedf9ea09f' 
  AND token = 'A6jqrSRWeceuFAltsdIawawCOAAxPn9ZY+qDVZfHJsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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