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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2324c0187a3667ebcbd4726a99e5479e60365827e3707bf66168049f670c4a60' 
  AND token = '22Oohz42ilQ8bIs+5DGY6Tm4VO6Lwx+pATrx8F0A71A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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