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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6a9c2e4ef4798adfbdb1f101438aeec838bea915eca96fa9dd0c773b96c444c' 
  AND token = 'sfecIaHdb4Vy/y9WPlIr1ou8b2R6j5CjkBZhT2echTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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