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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0231937ec23dcb260ccf5a59f4da301ee545c4cccea534d7ce70d46da283ffd1' 
  AND token = 'b2AMiMiu16GJ23X9KmybfTcI3bAXAjobVkALNu1C+Do=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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