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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a61fc1d5c44f8f24bb91250c7558ea378ecbba50e508d4e0806e0e9163875676' 
  AND token = '7ylKe9otY5/yZ/ek8ntSHLJlxNxIng2/7JBaTngGSis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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