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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fcab60f49c2dae8f806cee0e51afecd096203aec9d6567b0a3b512b00361e30' 
  AND token = 'mjF6Qj9kzKC6IkFS3SYgT9CXtMepA8ZLzxFy/r4x4H0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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