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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff7d2b43d9b557831ea7f20989211e935e4c6733ef04d988c9d9ff4fee110260' 
  AND token = 'no361MEqfVgSodckrdGa7ML0eo43SFvl4EajveMk/Ms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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