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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32d6676a60ecd92548dd652bc777959ff6ffa99c44c9ca2b88c2476cce9ad884' 
  AND token = 'kcZvvrBg+lGYgR959ajNftC35Y1J1fEtTCrryZeRtVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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