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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e246852a24ad5dc16f25802dbef34d3649dd338b48b91b7fa319d8544773465e' 
  AND token = 'Vtqgl5zpOqDd4rYdtdsdjYvX8XBRlvljjDzTOx0gfpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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