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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38e5f9ae5c0a8bc3f72b0061ee26e7e6a092464c16e745e1776ef3770b424deb' 
  AND token = 'yB06Low8i4+MkK22nUHPEyU5RXisgI/vPg2KcZvVaEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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