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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66b1ad671934fcb399f9176e756b3d565a85c9b090483f6838db7491a9cde07f' 
  AND token = 'XcWwYGw08pGnQf0G2QpRXwit/1bNTS5NE7x2pl716T0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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