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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '408f1be45ff6deaf87aabfebba6d4336abf32731feb29464a15e8021d0bf1dc7' 
  AND token = 'Rs9a/fInjeJi+XZKA+taZJMewqXMdDMBqU493wXreVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00076

JSON explain

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