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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55c7750c7469b3657f4035c27866b615f7fcb5fc4ba5cb5733078b5fcdca663f' 
  AND token = 'UeJCbfHKonJv4AI4ArX1rnRyHBJDZAEo69R2w9Od93A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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