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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8359d1c1cb1bc3a0dc044d98c1721862f057a583ca41c219f81592b44f46ddc7' 
  AND token = 'O0DQs6VBT6bi4kvO+erS0PhSuoMcLejjSryYHJQHPkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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