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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7835aa538a16774ed3010d5aa96ff5e6cf504d8b913d133772594c1ef28e407b' 
  AND token = 'DMRDICvXODsOrDIVeeAhOiLWfh4bX+DnC8/1HThc/qw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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