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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa1bda122932d0834a82f5420e0c38b1967c9346d79acdc986bfaeef3753620a' 
  AND token = 'd+X+oy+edzgybCkf+a+NPDrzBv4v+NTItVCgO/c/EvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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