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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bca53e9b36e4f4eed6a0b6527e5e804cdc4fb1d07a7ca5210fe31dafefef6cc2' 
  AND token = 'v2YeroMmqarocfOzs8sxOjQO1siL2Rfhd8jRDG2WWZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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