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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86d2f832a612c02102173031ea018d44bd57a1b74da27cc46e3f6f98aadec1ef' 
  AND token = 'OL50IIV9A6HlPVkJRCNHM1MM2J+K7SUo6O1aH5AKHNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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