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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '661bd491081dc6bdb2dba72be76a638ea829073921efc32523c0d1d325334d82' 
  AND token = 'gdjDG+N5BtkFGYm0Vw7XZ00moQ1cImMYYkM14u11onQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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