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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08e9f6569a05396e28f0c926abb640e996c4bd3df2ed0abb4ccfe11b1b81d8c0' 
  AND token = '5zx4RCqeNwd6OpeeUOy6hL6xa52cfKksbrSMcyLNDwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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