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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58908bf5b75723bed39933e7abfb7ae71010d3797402c14fcc84b6d18f097db0' 
  AND token = 'puaNCXLU7TL2iEjCznKzomzNqtnlGu2SP7/4PyVgpug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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