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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '185906a39721dd8a648f298fb090eeb534f2c386980cbc67d8789e8c49474d83' 
  AND token = 'VO+tIFbKuadOPD+EtsZEX0t6ZArKVD2LiQWuapTY/cY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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