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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8b60b573464a61a8e1f17d7490b7cc0325bb35567711353ecdc65e2aec24fb4' 
  AND token = 'YzobKEonLs025AXs+cwTGUm3C42MOO2HI/V+goIhbEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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