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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ce0513e9a4e932e6399233d8df98e4b1d4e03a584ab5c7d64c03cf50196d154' 
  AND token = '+EmwJ7O9pReVrYS+p2GsYLblHWH/Vqh56rpCEeuDwc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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