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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '412b8374984195318506b1551f6a6e580094c5215f0524ba943ab4e48fa5d3e8' 
  AND token = 'B68LUBl0ws/P1Ab/eqUinmdoRHBg5CUcQCGiyQ0/t9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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