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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bfb14eda7b1705c3514fed77080b6312698a2dbaaef524f537179d02b84e0b0' 
  AND token = 'r7+Nrs+LPgfSODNfwAN29oFfGfEKZheTFgi85k4kV/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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